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3nass042401 -- Spine specialist Joel Press of Chicago demonstrates exercises to prevent back injury during a lunchen put on by the North American Spine Society while Representative Charlie Norwood, R-Ga, looks on.

3nass042401 -- Spine specialist Joel Press of Chicago demonstrates exercises to prevent back injury during a lunchen put on by the North American Spine Society while Representative Charlie Norwood, R-Ga, looks on.

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